Device for favorably guiding the propeller water of ships



July 1,1924, 1,500,073

, H. HASS DEVICE FOR FAVORABLY GUIDING THE PR OPELLE R WATER OF SHIPS Filed. May 24. 1923 2 Sheets-Sheei 1- II I l I Fig.4.

July 1 1924. Q

1,500,073 H, HASS Y DEVICE FOR FAVOEABLY GUIDING THEIPROPELLER WATER OF SHIPS.

Fig.3.

2 Sheets-Sheet. 2

Fig.5. .0

Fild May '24. 1923 fiacs:

in si Patented duly UNHTED HANS BASS, or announcer, rama HAMBURG, GERMANY.

Application filed 24,.

To all whom may 05mm; 7

Be it known" that' I, HANS i? ss, a citizen of the German Reich, residingvat Bergedorf, near Hamburg, Germany, have mvented certain new and useful Improve? 1923, Serial No. semoe.

bearing 23nd one guide body 4 below the hub; These uide bodies do not project laterally much forthe propeller but they areessentially sit- )60 .uatedwithin the range of the same and of om the face of the stern frame ments in Devices for Favorably Guiding the theships-body adjacent to'said stern frame.

Propeller Water :ofShips (for which an application for platent' has'gbeenjfiled in Germany on the St ofJune5gl922), of which the following is .a' specification.

The stern postsof known typewith ing' devices possess the inconvenience that they are 'of complicated construction and that they comprise parts which project sidewards. 'The cost of manufacture is therefore comparatively high and there/is al-' ways the possibility that-the laterallypro jecting parts, will come in contact with wharfs, iles or the like, and breakage might result. %or these r'easons the guiding devices were not' adapted for-navigation notwithstanding the increase of .efi ciency' of the propeller. p

According to thisinvention the inconveniences are overcome by creating a stern post which comprisesno'laterally projectingparts so that thestemisof a shape.

easily to cast, the danger-of breakage of apart of the stem being reduced The subject of the invention is illustrated, by way of example, "on the accompanying drawing, wherein':--v I Fi 1 shows the subject of the invention dc elevation, designed for a tug. Fig; 2 is across section on line lif -II of Fig. 1.

Fig. 3 shows a l- .1a. elevation the sub ject of the inventiont'designed for a large sized motor-ship. p Fig. 4 shows the stern frame for the pro pellerin front elevation. p

Fig. 5 "s a horizontalbrosssection on line VV on enlarged scale.

Fig. 6 shows in side elevation the lower part of the stern framefor the propeller according to a slight modified form of construction; I

Fig. 7 is a side elevation of the lower part of a stern frame for the propeller according to another modified form of construction.

Fig. 8 is a horizontal cross section on line VHL-VIII of Fig. 7.1 I a According to .this invention entire post 1 of the propeller frame only one guide body 3 is arranged above the shaft or tail shaft in which the part of' 'the stern post proper, asfor example,

areiinfiuenced in a specially favorable man- A construction has proved to be specially suitable in which the length L of epcp'ropeller as it becomes possible in oft this manner to mountthe propeller? somewhat oif the rear edge of the'guide body "so that, owingto the large interval produced', objects floating on the water, for instance branches of trees, pieces of wood and the like lare not more dangerous than with stems of usual construction. Th action of the guide faces on the propeller is "nevertlieless preserved. v The dimensionsare selected in accordance with the relation of speed of ship to propeller slip and interval between propeller and guide body in order to make the guide body only of; accurately the length which corresponds to a maximum degree of eficiency. 4

.- In Figs. 3 -to"5 an arrangement is shown V 5 of the after portion of; the ship which joins the stern post is also 0- utilized for the guiding efiect. Also in this case the guide bodies 6 and 7 are made'in one'piece with the stern frame 8- for the pro: peller and Fig. Aqshows clearly how the" was faces extend essentially in the range "ith a lefthand propeller or left pitched screw the. guide surfaceb extends above theshaft bearing toward the starboard, and

ide surface 7 under-theshaft bearing toward the-larboard, for the purpose of further diverting the water passing along the ships sides, which is already somewhat-diverted by the unilateral construction of the ships hull, and forfpassing it with this degree of diversion into the propeller.

In order to increase the degree of efiiciency: of theguide bodies slit-like passages 9 are provided-at the root, of the guide bodies according to the form of ,construc tion shown in Figs. 6" and 7, said passages permitting a determinedquantity of water I the guide, body is greater than'the diameter 70 to flow from the pressure side of the guide bodies to the suction side of the same so that the detrimental formation of eddies on the suction side is considerably reduced.

The slit-like passages present the great advantage that the guidebodies may be" much more curved and can consequently'exa ert a greater influence upon the propeller, whereby the possibility is given to make the guide bodies of smaller width than. other wise so that in this manner itvbecomes posv sible to mount the guide bodies in an existproduct of the velocity of rotation imparted tothe water by the guide faces (component in the propeller plane) into the'radiusof' the several points on the guidebody is maintained constant over the entire length of the guide bodies.

I'clainiz- 1. A device for favorably. guiding the water into the propeller of single screw ships comprising in combination a stern post, a shaft bearing in the same, a single guiding member above the shaft bearing and a single guiding member below the. shaft bearing, both of these guiding members being arranged in front of the propeller and being the only guiding members associated with the vpropeller, said members being curved inversely to the direction of rotation of the propeller and extending laterally essentially within the range of the stern post.

2. A device for favorably guiding the waterinto the propeller of single screw ships comprising in combination a stern post, a shaft bearing in the same, one single guiding member only above the shaft member and one single guiding member only below'the shaft member, these guiding members being arranged in front of the propeller and being curved inversely to the direction of rotation of the latter and also being combined with the stern post and extending laterally essentially within the range of the same.

3. A device as claimed in claim 1 in which each of said guiding members is substantially vertically arranged and in which the central lines of the water line sections project from the central plane of the ship oppositely to the direction of rotation of the pro peller, each of said guiding members being provided with slits extending from the pressure to the suction side of the same.

4. A device as claimed in claim 1 in which said guiding members are perpendicularly arranged and in lwhich the central lines of the water line sections project from the cen-, tral plane of the ship oppositely to the direction of rotation of the propeller, said members having slits leading in oblique direction from the pressure side to the suction side of the members. 1

5. A device as claimed in claim 1 in which said guiding members consist of a perpendicular body, and in which the central lines, of the water line sections project from the central plane of the ship oppositely to the direction of rotation of the propeller, said body having slits leading from the pressure side to the-suction side of the body and the portions of the body between said slits forming feet for fixing the body on the stern post. 7

.6. In combination, a ship provided with a stern post having a shaft bearing, a shaft in said bearing, a propeller on the shaft arranged rearwardly of the bearing, two guiding members only associated with said bearing, arranged in front of the propeller and one extending upwardly from the bearing and the other extending downwardly from the bearing, and each of said guiding members being curved inversely to the direction of rotation of the propeller, being combined with the stern post and extending laterally essentially within the range of the same.

In testimony whereof I afiix my signature in presence of two witnesses.

. HANS HASS. Witnesses:

A.KAs1 Atn3,

H. DEIOKE. 

